| 摘要 |
PURPOSE:To save the complicated trouble of supplying water and energy loss by a structure wherein water is directly supplied in a circulating passage from a feed water piping through a pressure reducing valve with check valve, when the water in the circulating passage decreases, in a gas instantaneous hot water supplier equipped with a dual circuit-in-two heater type additional burning device or space heaters. CONSTITUTION:A pump 7, a water flow rate sensor 8 and an inlet temperature sensor 9 are provided in the order named from the upperstream side in the circulating return pipe 3a and an outlet temperature sensor 10 in the circulating return pipe 3b in a circulating flow passage 3 within a device main body 11. The portion lying between the outlet of a radiator 2 and the pump 7 of a circulating flow passage 3 is connected to the upperstream side of the water flow rate sensor 25 in the feed water piping on the hot water supplying side through a communicating pipe 6 equipped with a pressure reducing valve with check valve 5. If the water in the circulating flow passage 3 decreases from some cause such as vaporization or other, the pressure reducing valve with check valve opens itself and water is supplied from the feed water piping 23 to the circulating flow passage 3 every time the valve 5 actuates. |
